Operas MUSIC 267 Opera 241 Opéras 230 Genres & Styles 225 Criticism and interpretation 162 Librettos 151 Analysis, appreciation 56 Printed Music 50 Analyse et appréciation 47 Instruction & Study 38 Lyrics 36 Vocal 36 Voice 36 Music 17 General 12 Oper 11 Opera & Classical Scores 11 Opéra 11 Performances 9 Production and direction 9 Scores 9 History and criticism 8 Óperas 8 Interprétation 7 Philosophy and aesthetics 7 Theater 7 History 6 In opera 6 Individual Composer & Musician 6